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Finding the Fourth Proportional to 423.78, 636.21 and 404.16

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Solution

The fourth proportional to 423.78, 636.21 and 404.16 is: 606.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.78 : 636.21 = 404.16 : x
  2. Step 2: Convert to fraction form
    423.78/636.21 = 404.16/x
  3. Step 3: Cross multiply
    423.78x = 636.21 × 404.16
  4. Step 4: Simplify right side
    423.78x = 257,130.63
  5. Step 5: Solve for x
    x = 257,130.63/423.78
  6. Step 6: Final answer
    x = 606.75

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.